Platen-carriage holder for type-writers.



H. E THERIDGE.

PLATEN CARRIAGE HOLDER FOR TYPE WRITERS.'

APPLICATXON FILED FEB. 16. 1915. I V v Patented Feb. 10, 1916.

SHEETS-SHEET l H. ETHERIDGE. PLAT EN CARRIAGE HOLDER FOR TYPE WRITERS.

I A PPLICATION FlL-ED FEB.16. I915. 1,172,016. Patented Feb.15,1916.

2 SHEETS SHEET 2.

UNITE STATES PATENT OFFICE.

- HERBERT ETHERIDGE, or WIMBLEDON PARK, ENGLAND, ASSIGNOR TO THE EA -Loci;

TYPEWRITER COMPANY, LIMITED, OF LONDON, ENGLAND.

PLATEN-CARRIAGE HOLDER FOR TYPE-WRITERS.

Specification of Letters Patent. Patented Feb, 15, 1916.

Application filed February 16, 1915. Serial No. 8,541.

, To all whom it may concern:

" at Wimbledon Park, in Surrey, England,

Be it known that I, HERBERT ETHERIDGE, a sub ect of the King of England, residmg have-invented certain new and useful'Improvements in Platen-Carriage Holders for Type-Writers, of which the following is a specification.

This invention relates to platen-carriage :holders for typewriters, wherein the holder with the carriage is bodily detachable from the machine base by the operator without the use of tools. Such carriage-holders have already been made in which the spring driving-barrel for the carriage has been mounted on the holder so that the removal of the holder from the machine can loo-effected without disconneetingthe spring-barrel from r the carriage. The other mechanisms which -machine where the mechanisms are not easily observed in operation or easy of access for adjustment; moreover, when the escapelnent is mounted on the base and the spring-barrel on the holder, the carriage becomes freed from the escapement-mechanism as the holder is lifted from the base andthus having no restraining device flies with the full force of its driving-mechanism to the limit of its movement to the left of the holder which is inconvenient and may sometimes cause damage. It has been proposedto mount the driving spring with the escapement mechanism, line-locking mecha-' nism, margin stop, and bell, on a plate which supported the platencarriage, but this plate wasscrewed to columns on the machine base so as to constitute part of the frame of the machine andcould not be detached by the operator without the use of tools. a

One feature therefore of the presentinventionconsists in'mounting the escapement mechanism, as well as the springbarrel on the platen-carriageholder so that these parts come awayas-one piece with vthe holder when this is bodily removed. the arrangement being such that the holder can be removed and reattached by the operator without the use of tools.

The invention further relates to the mounting of other parts on the holder which parts also cooperate directly with the platencarriage and therefore require adjustment in relation thereto.

In the accompanying drawings which illustrate one method of carrying out this invention :Figure 1 is a plan of the carriage-holder with the various parts in position thereon; Fig. 2 is a section on the line 2-2 of Fig. 1, part of the bearing-member of the holder being broken away for the sake of clearness; F ig. 3 is a section on the line 3-3 of Fig. 1; Fig. 4 is'a section on the line 4-4: of Fig. 1'; Fig. 5 is a detail of the escapement-mechanism; Fig. 6 is a detail of the locking-1necl1anism;and Fig. 7 isa sideelevation of the platen-carriage.

The same letters indicate the same parts throughout the drawings.

The platen-holder comprises the usual pair of parallel bearing-members or runners A connected by transverse-members A which carry catches A for securing it to the base of the machine. The base of the machine is usually provided with studs. indicated at a which are headed or notched to receive the catches A and thus lock the holder firmly to the base. The spring-barrel B is carried by a base plate B made fast to the runners A and the arbor of the barrel carries a toothed wheel'B' which when the carriage is in place meshes with a rack X, Fig. 7, supported on the underside of the carriage Y. All these parts are the same as have been already employed. The base .cape-wheel whereof is indicated at (K The escape-wheel spindle also carries a toothed wheel C whose periphery on one side is in line with that of the wheel 1B so that the wheels 13 and C can both engage the rack X. 7

The escapement-mechanism may be of any convenient form, that shown being well known and as it constitutes no part of the present invention it need not be further describedexcept that the dogs D may be indicated as pivoted on a frame D also carried on the baseeplate B The dogs have a tail-piece D which, when the holder is in position on the base, lies under a bail-member indicated at Z, Fig. 5, carried by the base of the. machine and operated by the keys-and letter-spacing bar. It will be seen mechanism by lifting the holder and car- .r iage off the base, there is nothing to restrain the pull of the driving-barrel, and so the carriage is moved with the full force of the driving-mechanism to the limit of its travel to the left of the machine.

The mechanism for stepping the carriage back space-by-space is also shown as mount- .ed on the holder. This mechanism is of a form well-known and no claim is made therefor per se. pivoted at E on a link E which link is pivoted to a support on the plate B at E The tailend of the pawl is connected by a link .151 to an arm E on a rock-shaft E The rock;sha ft is controlled by a spring E which always tends-to keep it in such position that the pawl is thrown forward clear of the wheel C as shown in Fig.1, but on the rock-shaft is' an operating-handle E which, when depressed, swings the rock-shaft in such direction that 'the arm E is raised, and the pawl 15 is thus first-swung into enga'gement with the'wheel and then drawn backward to the left of Fig. 1, so that the wheel is rotated one tooth and the carriage is thus stepped back one space. The rockshaft E is supported in any convenient manner in bearings on the under-side of the front bearing-member A of the holder. A known form of brake-mechanism for tabulating is also mounted on the plate B of the holder. This comprises a toothed wheel F which normallyis held clear of the rack X on the carriage Y. The rotation of the wheel is retarded by a springF Fig. 3, in the usual manner and the wheel with its spring iscarried on a stud mounted on a 'frame F 'wh-ich can swing about a pivot F The frame is spring-controlled to-keep the wheel'clear of therack X, but an op- 'erating-memberon the base of themachine is arranged to contact with any convenient part operatively connected with the frame F to swiiig the wheel forward into mesh with the rack -X when the tabulating lever is pressed.

The margmand paragraph stop mem- It comprises a pawl E lever is up-turned and engages the usual margin-stop on the carriage.

A spring G connected at one end to'an arm G on the margin member and at the other end to 'a part carried by the bearingmember A. of the holder, tends to keep the tain amount of endwise movement,'but' the spring G normally not only keeps the left-- hand end raised but keeps' the member to the limit of its endwise movement to the right of Fig. 2. I

Pivoted at H on the holder-member A, is a paragraph-stop member H. Its left-hand end: is upwardly turned at H and cooper riage, but its right-hand end -carries a pin H which lies beneath the margin-stop member G. It thus follows that when the right-" hand end of the margin-stop member Gr is the dogs Such locking devices are wellknown, but the present one is adapted for mounting on the holder so that it may come away with the dogs when the holder is removed from the machine. This locking-device. comprises a'bent' bar. J which extends through the upturned sides of the plate B and when advanced for locking, lies beneath the bail-member Z but normally lies free of the same, as shown in Fig.4. The bar J is operatively connected with the margin-stop member G by a lever J (Fig. 6) -pivoted at J which lever is moved by a second lever J also pivoted at- J The second-lever has an upwardly turned ear J 4 which lies on one side of the lever J and it has an arm J which lies in the path of the arm'G on the ates with thevusual stop on the platen-,car-

is surrounded by aspring J 7 connected to I the arm' J and the torsional action of the spring normally keeps the arm J 2 and also thearm'-' J in the position shown in Fig.

H 1, so that'the rod-J is withdrawn fromv the ockingipositioni The arms J J are con--' te'djby a spring J so that if the arm J ema'de to'fo'llow it by means of the spring OhneIClilQIiJ As the platen-carriage comes 6' the end of its travel to the left of the ma- T e, catches the upwardly-turned leftmoved 'counter-cloclnvise, the arm J will hand end of. the margin-stop member G and i the spring G, thus com pulls thiSfto the, left against the action of Thearin G on the member into contact with the arm J to that thisis moved counm; Fig. 1, and carrying the arm 7, hit] \aclva ioes the rod J. If, as sometimes happens, the bail Z should be on the lever J partly down, ,as shown in dotted lines Fig. 4, the endotthe bar J will strike the bail and the arm J will thus be presented from moving with the ail- 111 .1 but no breakage of the partsnwill' occur because-thespring [J will'shoot into position beneath it; jWhen' Ll allows the lever J to remain behind. The lever J however, w ll-remain advanced so that as soon astheba l1sra-1secl,the bar the arm J is allowedto return under the controlofjits spring ,J it carriesthe arm The' b'ell Kj is also, mountedon the plate secure by Letters Patent ,is:

13 solas to coineaway with theholder and the hammer K for striking itis pivoted to ,a pin KFcarried by the rear operating-member] A of the holder."The hann'ner is controlled byhyspring' K and has a tail-piece .K'twhich is trippedin the usual umnner by the carriageas it nears heend of itstravel' "to the leftb 1: T

It willfe he seen from the above description that allthe parts which coiiperate in a direct 3 av with the platen-carriage are thus mounted on the (holder insuch manner thatthey can be operated in relation to the "carriage,withoutjplacing the holder and aarr age, ontlieimaclune; so that all these parts can be, readily observed and adjusted to accurately perforlntheuu.various functions, r 1 v, a x lVhat I elaun as my invention and desire f 1. :In a typewriterfdtachiible platen-carria ge (holder, j the combination of, two parallel' -runners (A). forthe platen-carriage, transverse members connecting these run-r ners ymeans \vhereby the operator without olsflcan detach the runners with 1 their transverse]members from the machine or 1'afattachthem; thereto, a spring driving-barrel inouuted between the runners on one ofthe transverse members as viewed in plan, an

esfcapement wheel mounted on one of the transverse members of the runners and between the runners as viewed in plan, a toothed driving wheel movable with the escapementwheel iwhieh driving-wheel gears with the carriagedancl dogs for the escapewheel mounted on one of the transverse members between the runnersas viewed in plan, so that all these parts can be opera fltivelv tested in relation to the carriagehol'der without placing the holder and carriage on the machine base, substantially as ,set forth M 2. Inatypewriter detachable platen-car riage holder, the emnbination of, two parallel runners (A) for the 'platen-carriage,'

twnsverse members connecting these runhers. means whereby the operator without tools can detach the runners with their transverse members from the machine or attach them thereto, a spring driving-barrel mounted between the runners on one of the transverse members as viewed in plan, an escapement-wheelmounted on one of the transverse members of the runners and'between the runners asIviewed in plan, a toothed driving-wheel"movable with the escapement-wheel which driving-wheel gears with the carriage, dogs for the escapewl1eel mounted on one of the transverse members between the runners as viewed in plan, a

vmargin stop member (G) mounted on the carriagediolder in position to cooperate with the usual stop on the platen-carriage and a key on the. base, and a paragraph-stop member (H) on the carriage-holder and operatively connected with the margin-stop 'mem-' :ber (Gr) to be moved into operative position by the movement of "the latter to the 'inoperative positiomso that all these parts can be'operatively tested in relation to the carriage-holder .wlt-hout placmg the holder andcarriage on the machine-base,substantially asset forth: e

8. In aty-pewriter detachable platen-carrlage holder, the combination of, twopar- "allelrunners (A) for the platen-carriage,

transierse members connecting these runners, means whereby the operator without ed on one of the transverse members he tween the runners as viewed in plan, ,a' rocking-shaft (15) mounted onthe carriageholder and extending from one end toward the center of the holder, a back-spacing pawl (E) mounted on the holderand arranged to engage the teeth of the driving-wheel carried by the escapement-wheel, and op-' erative connection between the pawl and the rocking'shaft whereby rocking of the shaft causes the pawl to turn the wheel engaged by it one tooth at each operation, all these parts being 30 arranged that, they'can, be operativelv tested in relation to the carriageriage on the machine-base, ,substan'tially as set forth. i z.

4. In a typewriter detachable "r'fl-aten-c'a'rf1v riage holder, the eomblnation of, two par? e holder withoutplacing. the holder and, car i tool j gmbers from the machine or attach hereto-,*a, spr1ng driving-barrel mountthemi't 3 -ed between;the runnersfon' one of the transverse members-as viewed in plan an escape .ment-wheel' mounted on one othe transver senlembers of the'ruianers and between v -the runners as viewedin plan, a toothed drivingswheel movable yvith the escapement- 1 wheel which driving-wheelgars with the carriage,- dogs for the escape wheel mounted on one Yet the transverse members between.

the runners" as, viewed in plan, and a bellmgechanism and .bell carried byv theholder,

that all 'these parts can be operatively tested"in relation to' the carriage-holder without placing the' holder and c'arria e" on the machine base', substantially as set orth.

- 5. In a typewriter detachable. platen-carriage holder, thecombination of, two parallel runners for the platen-carriage,

transve'rse members connecting these runners, means whereby the operator Without tools can detach ,the runners with their transverse members from the machine or attach. them thereto, a spring driving-barrelmounted between the runners on one of the transverse members. as viewed in plan, an

escapement-wheel mounted on one of 'the' transverse members ofithe runners and between the runners as viewed in plan, a

toothed driving-wheel movable with the.

' escapement-wheel Which driving-wheelgear's with the carriage, dogs. for the escape-wheel mounted on one of the transverse members between the runners astviewedin plan, a locking-bar carried by the holder and mov able into position to lock the escapement' mechanism, and means operatively connectparts can be operatively tested in relation' to the carriage-holder without placing the ing the locking-bar with the carriage as the latter arrives at'the end of its travel to the left of the machine, so that'all these flholder and carriage on the machinebase,

:substantially as set forth.

'6. In a typewriter detachable platen-car riage holder, the combination of, two parallel runners (A) for the platen-carriage, transverse members connecting these runners means whereby the operator withouttools can detach the runners with their transve rel mounted between the runners on'one of thetransveise members as -viewed in plan, an escapement-wheel mounted on one of the transverse members of the runners and between jthe .runners as viewed in plan, a

members from the machine or attach them thereto, a spr1ng dr1v1ng-bar toothed driving-wheel movable with the escapemen't-wheel which driving wheel'gears -w1th the carriage, dogs for the escape-wheel mounted'on' one of the transverse members between the runners as viewed 111 plan, a locking-bar carried by the carriage-holder and movable intoposition to lock the escapement mechanism, an arm (J pivoted by one, of its ends to the'holder and at the other end to the locking-bar, a second arm pivoted by one of its ends to the holder and having a lip. providing aone-way engageiment with'the" other arm, a spring connecjtlQIl which keeps the lip .of the one arm in engagement with the other, and means to provide operative connection between the platen-carriage as it comes tothe end of its travel to the left of themachine and the arm with the lip in s"ch manner as totend to move'thehp away from the arm engaged by it, all substantially as and for the pur-' 'rel and the platen-carriage, an escapementwheel mounted on the holder, a toothed driving-wheel movable with the escapement Wheel which driving-wheel gears with the carriage, dogs .for the escape-wheel mounted on the holder, a locking-bar carried by the holder andmov'able into position to foul the bail, a margin-stop member (G) pivoted on the holder and so arranged that in additiqn to engagement by the n1arg1n-stop on the platen 'carriage it can be engaged bythe platen-carriage as it nears the end of'its travel to the left of the machine, said member having its pivot-hole slotted so that it on the can be moved with the carriage as well as rock about itspivot, a spring which normally keeps one end of the member po-. srtion to engage the'carrlage and also keeps it with one end of its slot up against its pivot, and yielding operative connection between this member and the locking bar Bu that when the member moves jendwise the 'locking-bar-is yieldingly advanced tothe locking position, so that all these parts can be'operatively tested in relation to the carriage-holder without placing the holder and carriage on the machine ,base, substantially as set forth. v i a I a In testimony whereofI have signed my name to this specification in the presence of two subscribing witnesses.

-HERBERT ETHERIDGE; WVitnesses: V

H. D. JAMESON,

A. NU'rTIN-G.

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